Conveyer screen



A ril 23, 1929.

A. BOL 1,710,605

CONVEYER SCREEN Filed larch 26. 1928 4 Sheets-She et 1 NHIUIUIUIUIUUUIUEEUQIn g April 23, 1929. BOLE 1,710,605

CONVEYER SCREEN Filed larch 26. 1928 4 Sheets-Sheet 2 '1 7% i p k is i "I: 1 R l cu '4 E is 3 Q i I i q Y 3 A k 'II'III'," I '1 0* I II t 2 EJVM Hider Level April23,1929- E. OLE f 1,710,605

CONVEYER SCREEN I Filed larch 26. 1928 4 Sheets-Sheet 3 April 23, 1929.

Filed March 26. 1928 E. A. BOLE couvmmn SCREEN 4 Sheets-Sheet 4 Patented Apr. 23, 1929.

UNITED STATES EDWARD A. BOLE, OF LONG BEACH, CALTFORNIA.

CONVEYER SCREEN.

Application filed March 26, 1928. Serial No. 264,831.

The present invention relates to apparatus for screening material, such as for the sep aration of solid matter from sewage, and the invention aims to provide a novel and improved apparatus of that kind.

Another object of the invention is the provision of a novel and improved conveyor screen structure, having improved features of construction to incriase the etiiciency of the apparatus.

Another object of the invention is the provision of a sewage separation plant having novel features of construction to increase the efficiency thereof.

Vith the foregoing and other objects in View, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein- Figure 1 is a plan view of the sewage separation plant embodying the improvements.

Fig. 2 is a vertical section on the line 22 of Fig. 1.

Fig. is a cross section of one of the con veyer screen units, taken on the line 2:3-3 of Fig. 1.

Fig. 4: is a fragmentary longitudinal section of the conveyer screen unit, taken on the line i-l of Fig. 3.

Fig. 5 is a side elevation of the upper end portion of one of the conveyer screen units, showing the drum and conveyor in one posi tion in full lines, and in another position in broken lines, portions being broken away and shown in section.

Fig. 6 is a plan view of the fluid discharging device.

The sewage separation plant shown has three conveyor units disposed side by side, as seen in Fi 1, and. each of these units comprises an inclined frame 11 having the drums 12 in the upper and lower end port-ions thereof. with their axles mounted in bearings 13, which are preferably adjustable. The drums are of polygonal shape to accommodate the screen frames 14 which are hingedly con nected. as at 15, to constitute the conveyer chain. The screen frames 14 are of suitable metal, and in their outer surfaces are provided w th the grooves lfiadjacent to their marginal edges. Each frame has a central openmg surrounded by said grooves, and a screen panel 17 of suitable mesh is placed across the opening, and its edge portions are pressed within the grooves 16 of the frame. Strips 18 and 19 extending, longitudinally and transversely of the conveyor, respectively, are disposed in the grooves 16 to clamp the edge por' tions of the screen panel therein, and are fastened by belts or screws to the frame 14.

An angle iron scraper 20 is provided for each frame 14:, with one flange clamped below the rear strip 19, and the other flange projecting outwardly at the rear of said strip, and a guard piece 21 is secured on said strip 21 in front of the outstanding flange of the scraper 20 to protect it when encountering fixed parts of the structure as the frame moves in its circuit.

. The drums 12, referably the upper drum of each conveyor, iave angle pieces 22 which close the spaces between the screen frames 1 1, when said frames are swung relatively to one another in passing around the drums 12. This prevents solid matter from dropping between the frames 14 when passing over the upper drum l2. s i

The upper run of he conveyor moves on rollers 23 mounted in the frame 11, as seen more clearly in Figs. 3 and 4, and the frames 14 may move on the bottom of the conveyor frame 11 at the lower run.

The lower port-ions of the conveyor units are disposed within a basin 24 constructed of concrete or any suitable material, and hai in; an abutment 25 against which the lower ends of the frames 11 abut. The basin has an entrance chamber 26 in front of the conveyors, into which the sewage flows. from a pipe or conduit 27, and a deflector or spreader.

2S rises from the bottom of the chamber to deflect the sewage so as to spread it across the mouths of the conveyor units.

Each conveyer unit is provided at the receiving end thereof with side plates 29 mounted above the upper runs of the conveyer. Said plates 29 are secured by spacers 30 to uprights 31 of the frame 11. The plates 29 of each pair are connected at their lower edges by plates 32 under which the screen frames 14 move when starting upwardly from the lower drum 12, as seen in Fig. 4. The plate 32 has its upper edge terminating short of the upper edges of the plates 29, and below the water level of the basin and the liquid flows between the plates 29 and over the plate 32 to the conveyor. The scrapers 20 scrape along the lower surface of the plate 32, thereby preventing the solid matter from passing downwardly between the conveyor and said plate Apron strips are secured to the opposite sides of the side plates 29 by spacer bars 34, and flanges or angle irons 35 are secured. on the strips 18 of the screen frames 14 so as to pass between the plates 29 and strips 33, to prevent the solid n'latter 'lirom passing outwardly under the lower edges of the plates 29.

Threshold plates 36 extend from the bottom of the chamber 26 and overlap the plates 32 to direct the liquid and solid'matter from the chamber 26 over the plates 36 and to the conveyors, and the spaces between the plates 29 of the conveyor units are closed by part1- tions 37 and 38, so that sewage compelled to flow to the conveyors. Control gates 89 are slidable in guides 40 carried by the spacers 30, to control the flow of liquid to the conveyors, said gates being slidable vertically in the mouths of the conveyors.

Hoppers 41 are supported in any suitable manner below the upper drums 12 of the conveyers to receive the solid matter discharged. from the conveyors, and to deliver same into suitable receptacles. Drip pans 42 extend downwardly along the bottom portions of the frames 11 from the hoppers 41, and discharge into troughs 43 which have their upper terminals 44 extending under the lower edges of the pans 42, and the lower ends 45 of said troughs extend over the corresponding plates 29 to return the drippings from the conveyor back to the lower portions of the conveyors.

Each. conveyor is provided with means for dislodging the solid matter from the screens. Said means includes a t 'ansverse pipe 46 mounted for turning movement in bearings 47 on the frame 11 adjacent to the upper drum 12, and compressed air or other pressure fluid is supplied into said pipe from any suitable source. The pipe 46 has an arm 48 with a transverse discharge head 49 for directing streams or jets of the fluid downwardly through the screens 17 as they move over the hopper 41, as seen in Fig. 5, as at 59. The head 49 may move up ardly and downwardly with the oscillatory arm 48, and the head 49 has wheels 51 adapted to roll on the screen frames 14 alongthe same lines of contact as those of the rollers 23. This will maintain the spray head 49 at the samedistance above the screens even though the screen frames have vertical motion above the hopper 41 due to the polygonal form of the drum 12. The pressure of the streams is therefore maintained uniform with reference to the screens.

The head 49 may also be maintained close to the screens. As shown, a single arm 48 is used between the pipe 46 and head 49, with braces 52, although a plurality of arms 48 may be used.

Battles 53, 54 and 55 are disposed within the basin 24 in rear of the conveyors, and their lower edges are spaced above the bottom of the basin which slopes forwardly to a point below the forward or lower ends of the con veyers, so that sediment may ravitate to the forward end of the basin, liIOlTl which the sand and other sediment is pumped up through a pipe 56, by means of a pump 57. The central bafllo 54 extends above the liquid level, compelling the liquid as well as solid matter to :[low under said bafl'le, so that said battle arrests the lighter material. The balllcs 53 and terminate below the water level, and the basin 24 has a wier at its rear end over which the liquid discharges.

The basin 24 has a tank 58 at one side into which the pipe 56 discharges, and a drain pipe 59 extends from the bottom of the tank 58 for the discharge or sand and other heavier matter.

At one side of the basin 24 is a chamber 61 to receive the lighter material which discharges through an opening or outlet 62 in said side of the basin in front of the battle 54, so that oil and other lighter materials are discharged through the opening (32 into said chamber, from which they are pumped through a pipe 63 by a pump 64 and discharged into the tank 58. An overflow pipe 66 extends from the mouth of the chamber 58 into the conduit 27, for delivering the overflow and the lighter materials at the surface of the liquid in said tank back into the chamber 26 to return to the conveyors.

The liquid flows from the chamber 26 to the conveyors, so that the screens 17 arrest the solid matter, and the conveyors are actuated by a suitable motor or engine, so that the solid matter is carried upwardly on the upper runs of the conveyors. The solid matter drops from the screens into the hoppers 41, assisted by the discharge of compressed air or other pressure fluid downwardly through the screens.

The basin 24 is preferably cimstructed with a sidewalk or runway (37 surroumling the conveyor screens on which attendants may stand.

Having thus described the invention, what is claimed as new is 1. A conveyor having screens, and fluid discharge means discharging through the screens mounted for movement toward and away from the conveyor and contacting with the conveyor to be maintained in a predetermined spaced relation with the screens.

2. A conveyor having screens mounted for circuitous movement, and oscillatory fluid discharge means disc-hanging through the iii Ill)

cit

screens and having portions contacting with the conveyer to maintain said means in a predetermined spaced relation with the screens.

3. A conve *er comprising polygonal drums, hinged y connected frames movable in a circuit around said drums and each hav ing a screen, and fluid discharge means movahly mounted adjacent to one drum to dis charge through said screens, said means contacting with the screen frames to be maintained in a predetermined spaced relation with the screens.

at. A conveyor composed of hingedly connected frames having screen panels, means for mounting said conveyer for circuitous movement, and a mouth for the conveyer comprising side plates between which liquid flows to the conveyer and a plate connecting said side plates and over which the liquid flows, said screens moving under the lastnamed late, and said frames having scrapers at t ieir rear portions working along the lower surface of the last-named plate.

5. A conveyer composed of hingedly connected frames having screen anels, means for mounting said conveyer or circuitous movement, and a mouth for the conveyer com prising side plates between which liquid flows to the conveyer and a plate connecting said side plates andover which the li uid flows, said screen moving under the ast named plate and said frames having scrapers working along the lower surface of the last named plate.

In testimony whereof I hereunto afiix my signature.

EDWARD A. BOLE. 

